cleanup: removes ProjectivePrimeFieldPoint

p751toolbox/curve.go

@@ -28,15 +28,6 @@ type ProjectivePoint struct {
 	Z ExtensionFieldElement
 }
 
-// A point on the projective line P^1(F_p).
-//
-// This represents a point on the (Kummer line) of the prime-field subgroup of
-// the base curve E_0(F_p), defined by E_0 : y^2 = x^3 + x.
-type ProjectivePrimeFieldPoint struct {
-	X PrimeFieldElement
-	Z PrimeFieldElement
-}
-
 func (params *ProjectiveCurveParameters) FromAffine(a *ExtensionFieldElement) {
 	params.A = *a
 	params.C.One()
@@ -169,23 +160,12 @@ func (point *ProjectivePoint) FromAffine(x *ExtensionFieldElement) {
 	point.Z = oneExtensionField
 }
 
-func (point *ProjectivePrimeFieldPoint) FromAffine(x *PrimeFieldElement) {
-	point.X = *x
-	point.Z = onePrimeField
-}
-
 func (point *ProjectivePoint) ToAffine() *ExtensionFieldElement {
 	affine_x := new(ExtensionFieldElement)
 	affine_x.Inv(&point.Z).Mul(affine_x, &point.X)
 	return affine_x
 }
 
-func (point *ProjectivePrimeFieldPoint) ToAffine() *PrimeFieldElement {
-	affine_x := new(PrimeFieldElement)
-	affine_x.Inv(&point.Z).Mul(affine_x, &point.X)
-	return affine_x
-}
-
 func (lhs *ProjectivePoint) VartimeEq(rhs *ProjectivePoint) bool {
 	var t0, t1 ExtensionFieldElement
 	t0.Mul(&lhs.X, &rhs.Z)
@@ -193,23 +173,11 @@ func (lhs *ProjectivePoint) VartimeEq(rhs *ProjectivePoint) bool {
 	return t0.VartimeEq(&t1)
 }
 
-func (lhs *ProjectivePrimeFieldPoint) VartimeEq(rhs *ProjectivePrimeFieldPoint) bool {
-	var t0, t1 PrimeFieldElement
-	t0.Mul(&lhs.X, &rhs.Z)
-	t1.Mul(&lhs.Z, &rhs.X)
-	return t0.VartimeEq(&t1)
-}
-
 func ProjectivePointConditionalSwap(xP, xQ *ProjectivePoint, choice uint8) {
 	ExtensionFieldConditionalSwap(&xP.X, &xQ.X, choice)
 	ExtensionFieldConditionalSwap(&xP.Z, &xQ.Z, choice)
 }
 
-func ProjectivePrimeFieldPointConditionalSwap(xP, xQ *ProjectivePrimeFieldPoint, choice uint8) {
-	PrimeFieldConditionalSwap(&xP.X, &xQ.X, choice)
-	PrimeFieldConditionalSwap(&xP.Z, &xQ.Z, choice)
-}
-
 // Combined coordinate doubling and differential addition. Takes projective points
 // P,Q,Q-P and (A+2C)/4C curve E coefficient. Returns 2*P and P+Q calculated on E.
 // Function is used only by RightToLeftLadder. Corresponds to Algorithm 5 of SIKE

p751toolbox/print_test.go

@@ -38,10 +38,6 @@ func (point ProjectivePoint) String() string {
 	return fmt.Sprintf("X:\n%sZ:\n%s", point.X.String(), point.Z.String())
 }
 
-func (point ProjectivePrimeFieldPoint) String() string {
-	return fmt.Sprintf("X:\n%sZ:\n%s", point.X.String(), point.Z.String())
-}
-
 func (point Fp751Element) PrintHex() {
 	fmt.Printf("\t")
 	for i := 0; i < fp751NumWords/2; i++ {